I think this is a spring peeper. It's a wee critter, less than an inch [25mm] in length. I found it on the wall inside our house, near a plant that had been outside all summer. Guess I should check the plants more closely before bringing them in. I should also sweep up the dog hair more often. :)
Fantastic. I hear them, but never have seen one. Looks like what I see in the field guides with that X on the back. I assume you were able to get him back outside?
